HP 5920 series Configuration Manual page 21

Figure 11 IGMP snooping related ports
The following describes the ports involved in IGMP snooping:
Router port—Layer 3 multicast device-side port. Layer 3 multicast devices include designated
•
routers (DRs) and IGMP queriers. In
B are the router ports. A switch registers all its router ports in the router port list.
Do not confuse the "router port" in IGMP snooping with the "routed interface" commonly known as
the "Layer 3 interface." The router port in IGMP snooping is the Layer 2 interface.
Member port—Multicast receiver-side port. In
•
Ten-GigabitEthernet 1/0/3 of Switch A and Ten-GigabitEthernet 1/0/2 of Switch B are the
member ports. A switch registers all its member ports in the IGMP snooping forwarding table.
Unless otherwise specified, router ports and member ports in this document include both static and
dynamic router ports and member ports.
NOTE:
With IGMP snooping, all ports that receive PIM hello messages or IGMP general queries with the source
addresses other than 0.0.0.0 are dynamic router ports. For more information about PIM hello messages,
see "Configuring
Aging timers for dynamic ports in IGMP snooping
Timer
Dynamic
router port
aging timer.
Dynamic
member port
aging timer.
PIM."
Description
For each dynamic router port, the
switch sets an aging timer. When
the timer expires, the dynamic
router port ages out.
When a port dynamically joins a
multicast group, the switch starts an
aging timer for the port. When the
timer expires, the dynamic member
port ages out.
Figure 1 1, Ten-GigabitEthernet 1/0/1 of Switch A and Switch
Figure 1
Message received before
the timer expires
IGMP general query with the
source address other than
0.0.0.0 or PIM hello
message.
IGMP membership report.
14
1, Ten-GigabitEthernet 1/0/2 and
Action after the timer
expires
The switch removes the
port from its router port
list.
The switch removes the
port from the IGMP
snooping forwarding
table.